CHEMISTRY HIGH SCHOOL

As the temperature of a liquid increases, its vapor pressure(1) decreases
(2) increases
(3) remains the same

Answers

Answer 1
Answer:

As the temperature of liquid increases, its vapor pressure increases. Therefore, option (2) is correct.

What is vapour pressure?

Vapour pressure can be defined as the pressure exerted by a vapor with its condensed phases in a closed system at a given temperature. The equilibrium vapor pressure is also served as an indicator of the rate of evaporation of a liquid.  

A material that has a high vapor pressure at normal temperatures is commonly referred to as a volatile material. The pressure exhibited by the molecules of the gas above a liquid surface is called vapor pressure.

The temperature and the vapor pressure of liquid are directly related to each other. If the temperature of the liquid increases, more gasmolecules have the energy to escape from the surface of the liquid.

Therefore, the vapor pressure increases with an increase in the temperature of the liquid.

Learn more about vapor pressure, here:

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Answer 2
Answer: As the temperature of a liquid increases, its vapor pressure increases

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Boyle's Law shows an inverse relationship between:temperature and volume
temperature and number of molecules
pressure and volume
pressure and temperature

Answers

Answer: The correct answer is pressure and volume.

Explanation:

Boyle's law is one of the law used to determine the combine gas law.

This law states that the pressure of the gas is inversely proportional to the volume of the gas at constant temperature and number of moles.

Mathematically,

P\propto (1)/(V)     (At constant temperature and number of moles)

or,

PV=k

where, k is the proportionality constant

P = Pressure of the gas

V = Volume of the gas

Hence, the correct answer is pressure and volume.
BOYLE'S LAW STATES THAT THE PRESSURE OF A GAS IS INVERSELY PROPORTIONAL TO ITS VOLUME WHEN TEMPERATURE IS CONSTANT. P = K / V. K = PV

What is the gram formula mass of Ca3(PO4)2

Answers

Mass Molar of Ca_(3) (PO_4)_2
Ca = 3*40 = 120 amu
P = 2*31= 62 amu
O = (16*4)*2 = 64*2 = 128 amu
--------------------------------------
Mass Molar of Ca_(3) (PO_4)_2 = 120 + 62 + 128 = 310 g/mol

Therefore: What is the gram formula mass of Ca3(PO4)2 ?
Answer: 310 grams

What evidence caused Thomson to change Dalton's solid sphere model into the plum pudding model?

Answers

He found that the cathode ray elements have even negligible mass as compared to atoms. So he found that electrons are actually subatomic particles of an atom. That is why he suggested the plum pudding model.
Explanation:
He discerned that atoms contain charged particles, that he was known as electrons.
In chemist theoryThe indivisibility of associate, degree atom was proved wrong: associate degree atom is often any divided into protons, neutrons and electrons. but associate degree atom is that the smallest particle that takes part in chemical reactions. in step with a chemist, the atoms of the same part are similar all told respects.

It is common for students to overshoot the endpoint, meaning they add too much NaOH(aq) from the buret, which causes the solution to turn bright pink. What specific impact does this mistake have on the percent of acetic acid result?

Answers

Answer: the percentage of acetic acid will be low.

Explanation: The major aim during titration of acids and bases is to  determine the endpoint , that is exact point where the acid  in the beaker changes colour, (in this case, pink )with an additional  drop from the burette containing the base, since it is usually difficult to mark the equivalence point that tells us when  all the substrate in the beaker has been neutralized completely with the buretted substance.

Overshooting the end point is  an error which can occur when the person involved in the  the titration accidently goes beyond this  endpoint by adding too much of the substance(base) from the burette into the beaker missing the exact endpoint.

This implies that the person  has  added too much of the burreted liquid, ie the base than required  , making the acid in the beaker to continue to react resulting  to a lower concentration of the acid (acetic acid)  with excess base.(NaOH)

What is the scientific name for the layer of gas that surrounds the Earth

Answers

The scientific name for the layer of gas that surrounds the Earth is the atmosphere. It is a thin layer of gases which is composed of 78% nitrogen, 21% oxygen, 0.9% argon, 0.03% carbon dioxide and trace amounts of other gases. I hope this helps you. 

1. Why do all atoms of an element have the same atomic number, although they may have different mass numbers?2. What do we call atoms of the same element with different mass numbers?

3. Explain the meaning of each term in the symbol
(AZ)X

Answers

Atoms of an element have the same atomic number but different mass numbers because the atomic number only contains the amount of protons in an element.
Atoms of the same element that have different mass numbers are called isotopes.
With (AZ)X, the A is the number of protons, the Z is the number of neutrons, and the X is the electrons.
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